Philips TDA8808AT, TDA8808T Datasheet

INTEGRATED CIRCUITS

TDA8808T

TDA8808AT

Photo diode signal processor for compact disc players

Product specification			November 1987
File under Integrated Circuits, IC01

Philips Semiconductors	Product specification
Photo diode signal processor for	TDA8808T
compact disc players	TDA8808AT

GENERAL DESCRIPTION

The TDA8808 is a bipolar integrated circuit designed for use in compact disc players with a single spot read-out system. It amplifies the photo-diode signals and processes the error signals for the focusand radial control network.

Features

∙Data amplifier with equalizer and AGC

∙Offset-free pre-amplifier with AGC for the servo signals

∙Trackloss and drop-out detection

∙Start-up procedure for focus

∙Normalizing focus error output signal to minimize radial error interference

∙Laser supply amplifier and reference source

∙Both TDA8808T and TDA8808AT versions suitable for car, portable and home applications

∙Single and dual supply application

∙Focus in-lock signal; ready signal output (RD).

QUICK REFERENCE DATA

SYMBOL	PARAMETER	CONDITIONS				MIN.	TYP.	MAX.	UNIT
	Supply
VP	Supply voltage range					4,5	5,0	5,5	V
	External voltage range
Vext	TDA8808T					−5,5	−5,0	0	V
Vext	TDA8808AT					VP	10	12	V
IQ	Quiescent supply current
		Si/RD		= 0 V		7,5	10	12,5	mA
	HF input current
IHFin(p-p)	(peak-to-peak value)	fHFin = 100 kHz				3	−	10	μA
	LF input current
ID	(for each diode input)					0	−	6	μA
ILO	Laser supply output current					−8	−4	−2	mA
		Si/R7D			= HIGH Z
	Operating ambient
Tamb	temperature range					−30	−	+85	°C

PACKAGE OUTLINE

28-lead mini-pack; plastic (SO28; SOT136A); SOT136-1; 1996 August 13.

November 1987

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Philips Semiconductors	Product specification
Photo diode signal processor for compact	TDA8808T
disc players	TDA8808AT

Fig.1 Block diagram.

November 1987

3

Philips Semiconductors Product specification

Photo diode signal processor for compact	TDA8808T
disc players	TDA8808AT
PINNING

Fig.2 Pinning diagram.

November 1987

4

Philips Semiconductors Product specification

Photo diode signal processor for compact									TDA8808T
disc players								TDA8808AT
Pin functions
PIN		MNEMONIC				DESCRIPTION
1	GCHF					Gain control input of HF amplifier. Current output from HF amplitude detector
2	VP					Positive supply voltage
3	HFout					HF amplifier and equalizer voltage output
4	DET					HF detector voltage input
5	Sc					Starting up capacitor input
6						On/off control (start input); ready signal output (starting up procedure successful)
	Si/RD
7		Beq				Equalizer reference current input
8		Bgc				DC and LF gain control reference current input
9		FOC START				Focus normalizing circuit starting current
10		PLLH				PLL on hold output
11						Track loss output
		TL
12						Drop out detector suppression input
	DODS
13	Vext					TDA8808T
						Negative supply connection for FE and FElag output stage; also
						substrate connection
						TDA8808AT
						Positive supply connection for FE and FElag output stage
14	LPF					Low pass filter for Iret, used in track loss	(TL)	detector and LF gain control
15	FE					Current output of normalized, switched focus error signal
16	FElag					Current output of switched focus error signal, intended for lag network.
17	LO					Laser amplifier current output
18	LM					Laser monitor diode input
19	GCLF					Gain control input for AC and LF amplifiers. Current output from LF amplitude detector
20	Re2					Summation of amplified currents from D3 and D4
21	Re1					Summation of amplified currents from D1 and D2
23, 22	D1, D2					Current inputs to DC and LF photo diode amplifier
24, 25	D3, D4					Current inputs to DC and LF photo diode amplifier
26	HFin					Current input to HF amplifier
27	GND					Ground connection of device: also substrate connection for TDA8808AT
28	DEC					Decoupling input (internal bypass)

November 1987

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Philips Semiconductors Product specification

Photo diode signal processor for compact			TDA8808T
disc players			TDA8808AT
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
SYMBOL	PARAMETER	MIN.	MAX.	UNIT
	Supply voltage ranges (see Fig.3)
	TDA8808T
VP−V(ext)	pin 2 to pin 13	−0,3	13	V
VGND−V(ext)	pin 27 to pin 13	−0,3	13	V
	TDA8808AT
Vext−VGND	pin 13 to 27	−0,3	13	V
VP−VGND	pin 2 to pin 27	−0,3	13	V
	Output voltage ranges
VO	except FE and FElag	0	VP	V
VO	FE and FElag (TDA8808T)	Vext	VP	V
VO	FE and FElag (TDA8808AT)	VGND	Vext	V
VO	LM (open loop)	VGND	VP	V
Ptot	Total power dissipation	see Fig.4
Tstg	Storage temperature range	−55	+ 150	°C
Tamb	Operating ambient temperature range	−30	+ 85	°C
Tj	Operating junction temperature	−	150	°C
THERMAL RESISTANCE
From junction to ambient	Rth j-a		=	140 K/W

	Fig.3 Supply voltages; (a) TDA8808T,			Fig.4 Power derating curve.
	(b) TDA8808AT.

November 1987

6

Philips Semiconductors	Product specification
Photo diode signal processor for compact	TDA8808T
disc players	TDA8808AT

CHARACTERISTICS

VP = + 5 V; VGND = 0 V; Vext = -5 V (TDA8808T); Vext = + 10 V (TDA8808AT); VRE1 = VRE2 = 3,5 V; VFE = VFElag = 0 V (TDA8808T); VFE = VFElag = 5 V (TDA8808AT); RFOC START = 3,3 kW; IBeq = IBgc = 50 mA (current sources); Tamb = 25 °C; all voltages measured with respect to VGND, unless otherwise specified

SYMBOL		PARAMETER		CONDITIONS		MIN.	TYP.	MAX.	UNIT
	Supply
VP	Supply voltage range					4,5	5,0	5,5	V
	External voltage range
Vext	TDA8808T					-5,5	-5,0	0	V
Vext	TDA8808AT					VP	10	12	V
IQ	Quiescent supply current			VSi/RD	= 0 V	7,5	10	12,5	mA
	Reference input (Beq)
VBeq	Input voltage level					500	560	620	mV
IBeq	Input current					-	-50	-	mA
	Reference input (Bgc)
VBgc	Input voltage level					1,15	1,25	1,35	V
IBgc	Input current					-	-50	-	mA
	Decoupling input (DEC)
VDEC	Input voltage level					-	VP-1,4	-	V
ïZDECï	Input impedance					-	2	-	kW
	HF input (HFin)
VHFin	Input voltage level					-	1,4	-	V
	HF input current
IHFin(p-p)	(peak-to-peak value)			fHFin = 100 kHz		3	-	10	mA
ïZHFinï	Input impedance					0,5	1	2	kW
	HF part
	DC characteristics
	Gain (G1)	DVHFout		IHFin = ± 1 mA
		= ---------------------
		DIHFin
G1(max)	Maximum gain			VGCHF = 4 V		390	480	570	mV/mA
G1(min)	Minimum gain			VGCHF = 1,5V		-5	0	5	mV/mA
	AC characteristics
G2	Gain (G2)	= 20 log	VO1	note 1		2	3,5	5	dB
			----------
			VO2
G3	Gain (G3)	= 20 log	VO1	note 2		4	5,5	7	dB
			----------
			VO2
	Phase of input/output signal
f	at 1 MHz			note 3		-	p/2	-	rad.

November 1987

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